GNU bug report logs - #79305
31.0.50; MODE-set-explicitly change caused regressions in bind-map

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Package: emacs;

Reported by: Aaron Jensen <aaronjensen <at> gmail.com>

Date: Sun, 24 Aug 2025 22:19:01 UTC

Severity: normal

Found in version 31.0.50

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Message #38 received at 79305 <at> debbugs.gnu.org (full text, mbox):

From: "Aaron Jensen" <aaronjensen <at> gmail.com>
To: "Stefan Monnier" <monnier <at> iro.umontreal.ca>
Cc: Justin Burkett <justin <at> burkett.cc>, Jonas Bernoulli <jonas <at> bernoul.li>,
 79305 <at> debbugs.gnu.org, Sean Whitton <spwhitton <at> spwhitton.name>
Subject: Re: bug#79305: 31.0.50; MODE-set-explicitly change caused
 regressions in bind-map
Date: Mon, 01 Sep 2025 17:20:39 +0000
[Message part 1 (text/plain, inline)]
The attached demonstrates the problem, I believe.

Aaron

On Mon, Sep 01, 2025 at 9:31 AM, Aaron Jensen < aaronjensen <at> gmail.com > wrote:

> 
> It's my understanding that the check for set-explicitly is done because
> given where this hook runs, it's possible that the mode variable is not
> yet initialized, which means that even though it eventually will be, and
> thus could be relied on, it may not be. Therefore, bind-map relies on
> similar logic as the minor mode itself to determine whether or not the
> minor mode *will eventually* be enabled. It seems like your proposed patch
> to bind-map would be subject to this "hook race".
> 
> 
> 
> Again, this is just an informed guess as I haven't set up the conditions
> to reproduce it yet.
> 
> 
> 
> I have extracted the relevant bind-map code to my own library that
> depended on it:
> 
> 
> 
> https:/ / github. com/ aaronjensen/ emacs-leader-key/ blob/ master/ leader-key.
> el#L109 (
> https://github.com/aaronjensen/emacs-leader-key/blob/master/leader-key.el#L109
> )
> 
> 
> 
> Currently, it still relies on set-explicitly (accepting both forms), but
> if there's a way that we can get it to not I'd be happy to try it out.
> 
> 
> 
> 
> Aaron
> 
> 
> 
> On Mon, Sep 01, 2025 at 8:42 AM, Stefan Monnier < monnier@ iro. umontreal.
> ca ( monnier <at> iro.umontreal.ca ) > wrote:
> 
>> 
>>> 
>>>> 
>>>> 
>>>> After spending some time looking at the code, its history, and the
>>>> corresponding doc, my conclusion is that `bind-map`s code was probably
>>>> incorrect already with older Emacsen (just in different ways) and its
>>>> intended behavior is far from clear, so I think it's best to leave this as
>>>> a WONTFIX and let `bind-map`s authors figure out what to do on their side
>>>> (tho I'd be happy to help them figure that out).
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> You don't think we should even restore it and mark it as obsolete?
>>> 
>>> 
>> 
>> 
>> 
>> Since I believe bind-map's code was only half-working to begin with: no, I
>> don't think it's worth the trouble. It would just help them muddle
>> through. I'd rather help them fix their code for good.
>> 
>> 
>> 
>> Stefan
>> 
>> 
>> 
> 
>
[Message part 2 (text/html, inline)]
[repro-evil-local-override-race.el (application/octet-stream, attachment)]

This bug report was last modified 4 days ago.

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